"Blogging on Tumblr is sort of like being in high school," the statement reads. "But you know deep-down that you can't be in high school forever. Eventually, you have to move on."

Posterous (pronounced either post-er-us or paw-ster-us, you choose) goes on to make some contentions about its superiority that are subjective, at best, and inaccurate, at worst. Contrary to those claims, Tumblr actually has a "real commenting system," though it does require some tinkering with settings to enable. Also, Tumblr has a feature for posting by e-mail.

"The claims they make about Tumblr are obviously false," Tumblr founder David Karp wrote in an e-mail. "I hope they decide to make this right."

Tumblr and Posterous are among the most-hyped blogging platforms today. The former is renowned for its Apple-like sense of design, and the latter for its intelligence and flexibility with handling code in e-mail submissions.

The two make up a sort of east-coast, west-coast nerd battle, both figuratively -- Tumblr users are somewhat hipper and photo-driven compared to the geekier Posterous faithful -- and literally -- Tumblr is based in New York while Posterous is in San Francisco.

Posterous is primarily funded by Y Combinator, whose alumni includes the socially-equipped news site Reddit, location site Loopt and cloud file storage site Dropbox. A popular hangout for those affiliated with Y Combinator is Hacker News, which, as Karp was happy to note, doesn't seem to be siding with Posterous on this one.

For my own, non-Times-affiliated blog, I recently moved from Posterous to Tumblr. The Times mobile-focused blog I contribute to also uses Tumblr. We like the social networking features, many of which Posterous also has but are underutilized.

Tumblr started a couple years before Posterous, and nets significantly more users and visitors per month.

While these guys take a slightly different, more social approach to blogging, they remain dwarfed by giants like WordPress and the Google-owned Blogger platforms.

But who doesn't love a good quarrel between the folks who make the things we screw around on daily?

[Corrected, 7:54 p.m. An earlier version of this post said Posterous has been growing at a slightly more rapid pace than Tumblr. Not so.]